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// Copyright 2010-2011, Dependable Systems Lab, EPFL. All Rights Reserved.
// Copyright 2012, Google Inc. All Rights Reserved.
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#ifndef SRC_EXPR_EXPREVALUATOR_H_
#define SRC_EXPR_EXPREVALUATOR_H_

#include "expr/Expr.h"
#include "expr/ExprVisitor.h"

namespace seven_summits {
namespace expr {

class ExprEvaluator : public ExprVisitor {
protected:
  Action evalRead(const UpdateList &ul, unsigned index);
  Action visitRead(const ReadExpr &re);
  Action visitExpr(const Expr &e);

  Action protectedDivOperation(const BinaryExpr &e);
  Action visitUDiv(const UDivExpr &e);
  Action visitSDiv(const SDivExpr &e);
  Action visitURem(const URemExpr &e);
  Action visitSRem(const SRemExpr &e);

public:
  ExprEvaluator() {}

  /// getInitialValue - Return the initial value for a symbolic byte.
  ///
  /// This will only be called for constant arrays if the index is
  /// out-of-bounds. If the value is unknown then the user should return a
  /// ReadExpr at the initial version of this array.
  virtual ref<Expr> getInitialValue(const Array& os, unsigned index) = 0;
};

}  // namespace expr
}  // namespace seven_summits

#endif  // SRC_EXPR_EXPREVALUATOR_H_
